Dweets awesomed by u/Jenky

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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Current theme challenge: #Opposites

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alubenov

function u(t) {

x.fillRect(0,0,w=1920,h=1080)
s=this.s||[]
for(i=265;i-=1;r=s[i]=s[i]||Math.random()*h,x.fillStyle=R(i,i,i),x.fillRect((i*4*t+r)%w,r,6,6));

Mar 15 2017 6:16 PM UTC

}// 139/140

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Parallax stars field :-)

u/iverjo

Nice :) Here's my take on it: https://www.dwitter.net/d/81

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rpearl

function u(t) {

for(i=v=540,j=50,x[r='fillRect'](0,0,v*4,v*4);i--;)x[r](960+C(a=i*3.883)*i,v+S(a)*i,9,9,x.fillStyle=`hsl(${h=t*i},99%,${j*S(h/j)}%)`)

Mar 10 2017 11:21 PM UTC

}// 133/140

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I'm mostly just obsessively golfing the one cool demo I did and using the excess characters to add cool things... I should figure out more demos

u/donbright

this is joyous
u/FireFly

It's super pretty!
u/sigveseb

Super stylish!

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kchplr

function u(t) {

for(i=99;i--;A=T%6.35,r=50+((T/6.35|0))**1.05*10,r+=C(T*8-r)*r/10,x.fillRect(960+S(A)*r-r/84,540+C(A)*r-r/90,2+r/42,2+r/45))T=t*9+i/99

Mar 10 2017 8:09 AM UTC

}// 134/140

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u/jsizzle

Beautiful
u/stiaje

Seems to require chrome or Firefox 52 due to exponentiation operator :(
u/Xen

77byte Remix #2939
u/FireFly

I love it

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rpearl

remix of d/2006 by u/rpearl

function u(t) {

x.fillStyle=R(),i=v=540
x.fillRect(0,0,v*4,v*2)
for(;i;i--){a=i*3.883
x.fillStyle=`hsl(${t*i},99%,50%)`
x.fillRect(960+C(a)*i,v+S(a)*i,9,9)}

Mar 10 2017 4:25 AM UTC

}// 140/140

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u/sfz

Like a Ferris wheel at night! Ooh ahh
u/jsizzle

Beautiful

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kchplr

function u(t) {

for(c.width|=0,i=3e3;i--;X=S(t+i*.01)*500,D=1-((Y-540)**2+X*X)**.5/400,x.fillRect(960+X*D*1.7,Y+D*(100+S(t)*99),D*D*99,D*20))Y=(t+i<<2)%2e3

Mar 9 2017 6:42 PM UTC

}// 139/140

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u/jsizzle

Wow!
u/recursive

The movement looks like smoke. Very nice.
u/iverjo

Nice!
u/joeytwiddle

#smoke

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bga_

function u(t) {

for(n=16,W=c.width|=p=0;++p<64*n;)r=Math.exp(U=(p&64?63-p%64:p%64)/9),x.lineTo(W/2+S(a=U+t+6.28*(p>>6)/n)*r,c.height/2+C(a)*r);x.fill()

Mar 9 2017 5:25 PM UTC

}// 135/140

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Hypnos! n = count of segments / 2

u/iverjo

Very nice!
u/iverjo

#spiral #opticalillusion
u/384.cz

AWESOME
u/384.cz

AMAZING

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Jenky

function u(t) {

r=210;X=Y=O=20;n=new Date/1e3
b=d=>{x.fillStyle=R(d?0:r);x.fillRect(X,Y,r,r);Y+=X<r*7?0:O+r;X=X<r*7?X+O+r:O}
for(i=2;i<5e9;i*=2)b(n%i>=i/2)

Mar 8 2017 1:17 PM UTC

}// 139/140

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Binary representation of number of seconds passed since 1 Jan 1970

u/donbright

super cool

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magna

function u(t) {

n=64;for(j=n;j--;)for(i=n;i--;c=j<6&i<16?'@疄㖄ᖄ犜'.charCodeAt(j)-n&2<<i:S(t+=t*t|5),x.fillStyle=R(c*=255,c,c),x.fillRect(i*30,j*16,n,n));

Feb 28 2017 10:38 PM UTC

}// 135/140

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Live feed from Amazon Data Center - Feb 28, 2017

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Jenky

function u(t) {

c.width=320;d=new Date/1e3;r=9
a=v=>{x.beginPath();x.lineWidth++;x.arc(160,90,9*r--,0,v*.1047);x.stroke()}
a(d%60);a(d/60%60);a(d/3600%12*5)

Feb 28 2017 7:10 AM UTC

}// 140/140

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OS-time Arc Clock

u/donbright

love it!

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Renaud___

function u(t) {

l=c.width+=i=0;h=400;for(;++i<200;)for(j=a=(t+C(i))%2;j++<50;)x.fillRect(l*C(i*i)+~~a*(w=a*h-h)*C(j),(~~a?h:a*h)*(C(i)*C(i)+2)+w*S(j)/4,3,3)

Feb 27 2017 12:09 PM UTC

}// 140/140

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Show more comments…
u/HeyJD

This looks amazing. Great job.
u/Renaud___

Thanks :)
u/khalkeus

this is super neat
u/iverjo

Wow!
u/lionleaf

Brilliant!
u/tbroadley

Sweet!
u/donbright

OMG OMG OMG OMG
u/ninerdelta

mind blown
u/sfz

(((does we're not worth bow)))
u/Kalanchoe

That's so beautiful!
u/spbyrne

Incredible
u/Renaud___

wow ... thanks again for all the nice reviews :)
u/punkhaa

mice
u/punkhaa

*nice
u/gormisdomai

I joined this site for this kind of thing
u/lionleaf

On mobile you can tap at different locations for different colors
u/lionleaf

Haha, oops, that comment was for another dweet. This still remains one of my favorites!!
u/sigveseb

golfed to 137: for(l=c.width+=i=0,h=400;++i<200;)for(j=a=(t+C(i))%2;j++<50;)x.fillRect(l*C(i*i)+~~a*(w=a*h-h)*C(j),(~~a?h:a*h)*(C(i)**2+2)+w*S(j)/4,3,3)
u/FireFly

Eternal rains will come… I really like this one, very pretty!
u/zhanglongdream

啊啊啊
u/leonarven

It was really nice to solve the secret of this code! Such simple, but such brilliant! Good job!
u/sb

My favorite
u/arowberry

I love it. Reminds me of my Seattle days.
u/21medals

What does ~~ do? Like in (~~a?h:a*h)
u/Renaud___

It work as a math.floor. actually there is a difference but i dont remember how exactly
u/Renaud___

Dunno what changed in Chrome recently, but now this animation is very very slow :(
u/hollo47

#rain
u/noonat

~ is a bitwise not. It flips all the bits in the number to the opposite. Flipping again (~~) puts the bits back to what they were. It works does something similar to floor because it truncates floats to 32-bit integers as part of the operation. (But unlike floor, ~~-2.1 is -2 instead of -3.)
u/rbong

I did a detailed analysis of this effect in a medium post: https://medium.com/@r.l.bongers/visual-effec…
u/vain

cool raindrop fx

dwitter.net | Jenky (2198)